linux-kernel - Re: [PATCH 3/4] media: verisilicon: Hook the (TRY_)DECODER

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Message-ID: <fd9ca918dcbc892169b9f0dae7d0de537f4035ed.camel@collabora.com>
Date:   Thu, 09 Nov 2023 16:38:36 -0500
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Cc:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sebastian Fricke <sebastian.fricke@...labora.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/4] media: verisilicon: Hook the (TRY_)DECODER_CMD
 stateless ioctls

Hi Paul,


Le jeudi 09 novembre 2023 à 21:16 +0100, Paul Kocialkowski a écrit :
> The (TRY_)DECODER_CMD ioctls are used to support flushing when holding capture
> buffers is supported. This is the case of this driver but the ioctls were never
> hooked to the ioctl ops.
> 
> Add them to correctly support flushing.

While this CMD looks useful on paper, we have had no use for it in any
open source user space. So with this in mind, shall we really enable it
? How can we be sure that its actually working as intended ?

Nicolas

> 
> Fixes: 340ce50f75a6 ("media: hantro: Enable HOLD_CAPTURE_BUF for H.264")
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  drivers/media/platform/verisilicon/hantro_drv.c  | 2 ++
>  drivers/media/platform/verisilicon/hantro_v4l2.c | 3 +++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> index a9fa05ac56a9..3a2a0f28cbfe 100644
> --- a/drivers/media/platform/verisilicon/hantro_drv.c
> +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> @@ -905,6 +905,8 @@ static int hantro_add_func(struct hantro_dev *vpu, unsigned int funcid)
>  
>  	if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER) {
>  		vpu->encoder = func;
> +		v4l2_disable_ioctl(vfd, VIDIOC_TRY_DECODER_CMD);
> +		v4l2_disable_ioctl(vfd, VIDIOC_DECODER_CMD);
>  	} else {
>  		vpu->decoder = func;
>  		v4l2_disable_ioctl(vfd, VIDIOC_TRY_ENCODER_CMD);
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index b3ae037a50f6..db145519fc5d 100644
> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> @@ -785,6 +785,9 @@ const struct v4l2_ioctl_ops hantro_ioctl_ops = {
>  	.vidioc_g_selection = vidioc_g_selection,
>  	.vidioc_s_selection = vidioc_s_selection,
>  
> +	.vidioc_decoder_cmd = v4l2_m2m_ioctl_stateless_decoder_cmd,
> +	.vidioc_try_decoder_cmd = v4l2_m2m_ioctl_stateless_try_decoder_cmd,
> +
>  	.vidioc_try_encoder_cmd = v4l2_m2m_ioctl_try_encoder_cmd,
>  	.vidioc_encoder_cmd = vidioc_encoder_cmd,
>  };